To select a 64/110kV high voltage cable, start with the project’s electrical system data, installation conditions, applicable standards, and required accessories—not with price alone. The designation generally means a rated conductor-to-earth voltage (U0) of 64 kV and conductor-to-conductor voltage (U) of 110 kV; the associated maximum system voltage (Um) is commonly 123 kV. Buyers should confirm the exact voltage designation and governing specification with the project designer before requesting a quotation. At Zhongdong Cable Co., Ltd., we recommend sending the complete technical requirements so we can assess the cable configuration and quotation scope more accurately.
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This guide is for utility companies, EPC contractors, electrical consultants, distributors, and industrial project buyers evaluating 64/110kV cable for transmission or sub-transmission works. It is also useful when preparing a tender specification or comparing quotations that may describe different constructions. The right specification depends on the electrical network and installation, so this guide is a procurement framework rather than a substitute for engineering design. Buyers should have the project engineer approve final cable and accessory selections.
A 64/110kV cable is a high-voltage power cable intended for use in systems with the corresponding rated voltages. In the commonly used U0/U(Um) format, the class is often written as 64/110(123) kV, where 123 kV denotes the maximum system voltage associated with that designation. Check the tender documents and local requirements, because voltage notation and specification details may vary between projects. Do not infer the complete cable design from the voltage label alone.
Extruded XLPE insulation is a common design option for this voltage class, but the complete cable includes more than its insulation. A typical design may include a conductor, conductor screen, insulation, insulation screen, metallic screen or sheath, water-blocking features, and an outer protective sheath. Exact materials and layers depend on electrical, environmental, mechanical, and installation requirements. The project specification should define the required construction and applicable test requirements.
Copper and aluminium conductors may both be considered, subject to the required current capacity, route conditions, termination compatibility, and project preference. Their electrical and mechanical properties differ, so the conductor material and cross-section need to be selected through engineering calculations rather than by matching a competitor’s catalogue entry. XLPE is widely used in extruded high-voltage cable designs, but the insulation system must be specified and qualified for the intended voltage class. Ask suppliers to identify the proposed construction and provide the relevant technical documentation for review.
Before selecting a cable, identify whether the route will be buried directly, installed in ducts, laid in a tunnel, or routed through another arrangement. Each method changes heat dissipation, mechanical exposure, pulling requirements, and installation constraints. Soil thermal properties, burial depth, grouping, ambient conditions, and circuit spacing can influence the cable’s permissible current rating. Request an ampacity assessment based on the actual route and installation data rather than relying on a generic catalogue value.
Also consider route length, joints, terminations, bending limits, pulling forces, water exposure, and the need for longitudinal or radial water-blocking measures. Metallic screen design and bonding arrangements should be coordinated with the system design because they affect induced voltage and losses. For buried routes, sheath protection and provisions for sheath testing may also be part of the project requirements. The cable, accessories, and installation method should be reviewed together as one system.
Record the nominal system voltage, the required U0/U(Um) designation, system earthing method, fault level, protection clearing time, and design loading. Identify the governing standards, project specifications, and any utility-specific requirements. Where the specification includes temperature limits, check that they apply to the proposed cable design and operating conditions. For context, XLPE cable designs commonly use a maximum conductor temperature of 90°C for continuous operation and 250°C for a short-circuit condition, but the applicable values and duration must be verified against the governing standard and manufacturer’s design.
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Specify conductor material and cross-section, insulation and screen construction, metallic screen details, water-blocking requirements, and outer sheath material. Provide route drawings or a route schedule showing installation method, length, bends, joints, and site conditions. State whether the supplier should quote cable only or include joints, terminations, installation support, testing, or other services. This prevents a technically incomplete quotation from appearing cheaper than a more comprehensive offer.
High-voltage cable performance depends on compatible joints and terminations as well as the cable itself. Confirm the required accessory type, connection method, equipment interfaces, and any site-specific environmental conditions. Clarify who is responsible for accessory selection, installation, commissioning, and testing. If these responsibilities are divided among different contractors, document the interface requirements before purchase.
Ask each supplier to state the proposed design, technical deviations, quantity basis, packaging, delivery location, production schedule, and quotation validity. Confirm whether quoted quantities include manufacturing tolerances, spare lengths, or accessories. Check the inspection and test plan, routine and sample test scope, and any required witness or documentation arrangements. A clear deviation list makes it easier for engineering and procurement teams to compare offers consistently.
The price of a 64/110kV cable depends on factors including conductor material and size, cable construction, order quantity, raw-material pricing, accessory scope, testing requirements, and delivery destination. Longer or more complex routes may also require joints, special packaging, or additional technical coordination. Minimum order quantities and production lead times are supplier- and project-specific; they should be confirmed in writing rather than assumed from another cable voltage class. For a useful budgetary quotation, provide the requested quantity, delivery location, target schedule, and complete technical specification.
When evaluating total cost, include freight, handling, duties where applicable, installation accessories, testing, and the cost of resolving specification gaps. Ask whether the delivery schedule is based on approved drawings and finalized technical documents, since engineering clarification can affect production planning. Agree on inspection points and document requirements early to reduce procurement delays. Treat any stated schedule as subject to confirmed scope, production capacity, and order terms.
At Zhongdong Cable Co., Ltd., we encourage buyers to share the project voltage designation, applicable specification, installation method, cable schedule, and accessory requirements during the inquiry stage. This information helps us review the requested supply scope and identify points that may need engineering confirmation. Buyers can also state their target delivery schedule and preferred commercial terms so that technical and procurement discussions can proceed together. Final design approval should remain with the responsible project engineer and be based on the project’s governing requirements.
One common mistake is requesting a quotation using only “64/110kV cable” without defining construction, standards, route, or accessory scope. Another is comparing conductor sizes or prices without checking installation conditions and the assumptions behind current ratings. Buyers may also overlook bonding arrangements, joint locations, sheath requirements, and test documentation until after the order is placed. Resolve these items during specification review to reduce the risk of incompatible offers and late changes.
Choosing and procuring 64/110kV high voltage cable requires a project-specific review of voltage class, electrical loading, installation conditions, construction, accessories, testing, and supplier scope. The designation commonly corresponds to 64 kV U0, 110 kV U, and 123 kV Um, but the project specification must confirm the exact basis. To move forward, prepare a cable schedule, route and installation details, required standards, accessory scope, quantity, and delivery target. Send these details to Zhongdong Cable Co., Ltd. for a quotation review, then obtain engineering approval of the final technical offer before placing an order.
Contact us to discuss your requirements of 64/110kV High Voltage Cable. Our experienced sales team can help you identify the options that best suit your needs.